icmp6 action is used to replace the IPv6 packet been processed with
an ICMPv6 packet initialized based on incoming IPv6 one.
Ethernet and IPv6 fields not listed are not changed:
- ip.proto = 58 (ICMPv6)
- ip.ttl = 255
- icmp6.type = 1 (destination unreachable)
- icmp6.code = 1 (communication administratively prohibited)
Prerequisite: ip6
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> Signed-off-by: Ben Pfaff <blp@ovn.org>